Journal of Analytical Science and Technology

Table 2 Matrix of correlations

From: Urinary creatinine concentration and urine color as indicators of specimen validity test

Variables	Cr	Value	Chroma	L*	a*	b*
Cr	1	− 0.1159	0.7272	− 0.5836	0.2842	0.7111
Value	− 0.1159	1	− 0.1361	0.3665	− 0.3271	− 0.0757
Chroma	0.7272	− 0.1361	1	− 0.7169	0.3125	0.9881
L*	− 0.5836	0.3665	− 0.7169	1	− 0.5871	− 0.6411
a*	0.2842	− 0.3271	0.3125	− 0.5871	1	0.1728
b*	0.7111	− 0.0757	0.9881	− 0.6411	0.1728	1

The CIELAB color space, also referred to as L*a*b* expresses color as three values: L* for perceptual lightness and a* and b* for the four unique colors of human vision. Thus each of L* a* b* can be viewed as a single variable for the CIELAB color space

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